Interstate system for standardization. Interstate standards, rules and recommendations on interstate standardization. Procedure for development, taking over application, renovation and cancellation
Lanthanum, neodymium, gadolinium, dysprosium, yttrium, and their oxides. Method of determination of impurities as oxides of praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium
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